Masun

Masun (died 1191) was a Shia imam from Masyaf who was killed by the Hashshashin in 1191 for allowing the Templars into the city during their attack.

Biography
Masun was born in Masyaf, Syria, and he became a local Shia imam. He was exposed to the ethos of the Templar Order during the Crusades, and he became an enthusiastic convert to their worldview, supporting a world of equals, repentance of people from their wicked ways, and a rebellion against Rashid ad-Din Sinan (whom he called "the Madman of Masyaf"). In 1191, he opened the gates of Masyaf to Robert de Sable's Templar army when it came to besiege the city, but the siege was repulsed, and Masun was quickly discovered to have been the traitor. However, Sinan sent Altair Ibn-La'Ahad to "discover" who the traitor was, as he wanted him to have an easy mission to prove that he could re-learn the ways of the Assassins. Altair beat down Masun after he left a speech, and he brought him to Sinan, who ran him through with a sword after he refused to tremble or yield before Sinan, saying that he would die a martyr for his just cause.